Add ActiveRecord integrated state machine functionality.
acts_as_state_machine and AASM didn't feel quite right to me.
Validations and guards were redundant, transitions were not observable and direct manipulation of state attributes did not result in transitions.
This is an attempt to make it work (the way I thought it should).
# models/user.rb
class User < ActiveRecord::Base
has_states :signed_up, :unverified, :verified, :disabled do
on :invite do
transition :signed_up => :unverified
end
on :verify do
transition :unverified => :verified
end
on :disabled do
transition :verified => :disabled
end
on :enable do
transition :disabled => :verified
end
end
before_enter_unverified :set_verification_key
...
end
# models/user_observer.rb
class UserObserver < ActiveRecord::Observer
def after_enter_signed_up(user)
UserMailer.deliver_signup_notification(user)
end
def after_enter_unverified(user)
UserMailer.deliver_invitation(user)
end
def after_enter_verified(user)
UserMailer.deliver_welcome(user)
end
end
States can be expired automatically:
class Subscription < ActiveRecord::Base
has_states :trial, :expired do
expires :trial => :expired, :after => 30.days
...
end
end
And to expire them just call:
Subscription.expire_states
You might like to put this in a cron job.
$ script/plugin install git://github.com/sbfaulkner/has_states.git
Author: S. Brent Faulkner [email protected]
Updated: D. Draper, K. Pitt, CodeFire [email protected], 2010
License: Copyright © 2008 unwwwired.net, released under the MIT license